Cloning objects to multiple locations in Sverchok
Inspired by some examples elsewhere, here's my best attempt so far, but it doesn't (yet?) solve the problem of setting A and C to a different scale from B and D...



...but as far as it goes, it looks a bit tidier.

EDIT:

Right, so, with Kabu's help, the inclusion of a 'simple?' List Input has solved the next part of the puzzle. Very neat - although Kabu has suggested that there is room for further optimisation as consequence of redundancy!!

(https://blend-exchange.giantcowfilms.com/b/JoWGSlO7/)